I ordered the 46. Trust me, if the 50cm had worked, I would have bought it right then and there while it was in my hot little hands!

Based on the top tube numbers, I was thinking I needed a 42, but both of the bike guys recommended the 46, so I bowed to their expertise - with the bonus that that one's in stock! (That inseam measuring thing is awkward!)

My ancient Jamis Aurora is a 50cm, so I think I should be ok.

And Tulip, I've been doing lots of Bikram Yoga and it's doing wonders for my core! I can't wait to try out my new belly with my new bike!